configure.ac - third_party/libimobiledevice - Git at Google

 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.

 AC_PREREQ([2.68])
 AC_INIT([libimobiledevice], [m4_esyscmd(./git-version-gen $RELEASE_VERSION)], [https://github.com/libimobiledevice/libimobiledevice/issues], [], [https://libimobiledevice.org])
 AM_INIT_AUTOMAKE([dist-bzip2 no-dist-gzip check-news])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
 AC_CONFIG_SRCDIR([src/])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])

 dnl libtool versioning
 # +1 : 0 : +1  == adds new functions to the interface
 # +1 : 0 : 0   == changes or removes functions (changes include both
 #                 changes to the signature and the semantic)
 #  ? :+1 : ?   == just internal changes
 # CURRENT : REVISION : AGE
 LIBIMOBILEDEVICE_SO_VERSION=6:0:0

 AC_SUBST(LIBIMOBILEDEVICE_SO_VERSION)

 # Check if we have a version defined
 if test -z $PACKAGE_VERSION; then
   AC_MSG_ERROR([PACKAGE_VERSION is not defined. Make sure to configure a source tree checked out from git or that .tarball-version is present.])
 fi

 dnl Minimum package versions
 LIBUSBMUXD_VERSION=2.0.2
 LIBPLIST_VERSION=2.3.0
 LIMD_GLUE_VERSION=1.0.0

 AC_SUBST(LIBUSBMUXD_VERSION)
 AC_SUBST(LIBPLIST_VERSION)
 AC_SUBST(LIMD_GLUE_VERSION)

 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CXX
 AM_PROG_CC_C_O
 LT_INIT

 # Checks for libraries.
 PKG_CHECK_MODULES(libusbmuxd, libusbmuxd-2.0 >= $LIBUSBMUXD_VERSION)
 PKG_CHECK_MODULES(libplist, libplist-2.0 >= $LIBPLIST_VERSION)
 PKG_CHECK_MODULES(limd_glue, libimobiledevice-glue-1.0 >= $LIMD_GLUE_VERSION)

 # Checks for header files.
 AC_CHECK_HEADERS([stdint.h stdlib.h string.h sys/time.h])

 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 AC_TYPE_UINT16_T
 AC_TYPE_UINT32_T
 AC_TYPE_UINT8_T

 # Checks for library functions.
 AC_CHECK_FUNCS([asprintf strcasecmp strdup strerror strndup stpcpy vasprintf getifaddrs])

 AC_CHECK_HEADER(endian.h, [ac_cv_have_endian_h="yes"], [ac_cv_have_endian_h="no"])
 if test "x$ac_cv_have_endian_h" = "xno"; then
   AC_DEFINE(__LITTLE_ENDIAN,1234,[little endian])
   AC_DEFINE(__BIG_ENDIAN,4321,[big endian])
   AC_C_BIGENDIAN([ac_cv_c_bigendian="yes"], [ac_cv_c_bigendian="no"], [], [])
   if test "x$ac_cv_c_bigendian" = "xyes"; then
     AC_DEFINE(__BYTE_ORDER,4321,[big endian byte order])
   else
     AC_DEFINE(__BYTE_ORDER,1234,[little endian byte order])
   fi
 fi

 AC_CHECK_DECL([plist_from_json], [AC_DEFINE([HAVE_PLIST_JSON], [1], [Define if libplist has JSON support])], [], [[#include <plist/plist.h>]])

 # Check for operating system
 AC_MSG_CHECKING([for platform-specific build settings])
 case ${host_os} in
   *mingw32*|*cygwin*)
     AC_MSG_RESULT([${host_os}])
     win32=true
     AC_DEFINE(WINVER, 0x0501, [minimum Windows version])
     ;;
   darwin*)
     AC_MSG_RESULT([${host_os}])
     darwin=true
     ;;
   *)
     AC_MSG_RESULT([${host_os}])
     AX_PTHREAD([], [AC_MSG_ERROR([pthread is required to build $PACKAGE_NAME])])
     AC_CHECK_LIB(pthread, [pthread_once], [], [AC_MSG_ERROR([pthread with pthread_once required to build $PACKAGE_NAME])])
     ;;
 esac
 AM_CONDITIONAL(WIN32, test x$win32 = xtrue)
 AM_CONDITIONAL(DARWIN, test x$darwin = xtrue)

 # Check if the C compiler supports __attribute__((constructor))
 AC_CACHE_CHECK([wether the C compiler supports constructor/destructor attributes],
   ac_cv_attribute_constructor, [
   ac_cv_attribute_constructor=no
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
     [[
       static void __attribute__((constructor)) test_constructor(void) {
       }
       static void __attribute__((destructor)) test_destructor(void) {
       }
     ]], [])],
     [ac_cv_attribute_constructor=yes]
   )]
 )
 if test "$ac_cv_attribute_constructor" = "yes"; then
   AC_DEFINE(HAVE_ATTRIBUTE_CONSTRUCTOR, 1, [Define if the C compiler supports constructor/destructor attributes])
 fi

 AC_CHECK_MEMBER(struct dirent.d_type, AC_DEFINE(HAVE_DIRENT_D_TYPE, 1, [define if struct dirent has member d_type]),, [#include <dirent.h>])

 # Cython Python Bindings
 AC_ARG_WITH([cython],
             [AS_HELP_STRING([--without-cython],
             [build Python bindings using Cython (default is yes)])],
             [build_cython=false],
             [build_cython=true])
 if test "$build_cython" = "true"; then
             AC_PROG_CYTHON([0.17.0])
             if [test "x$CYTHON" != "xfalse"]; then
               AM_PATH_PYTHON([2.3], [
                 CYTHON_PYTHON
                 AS_COMPILER_FLAG([-Wno-cast-function-type -Werror], [
                   CYTHON_CFLAGS+=" -Wno-cast-function-type"
                   AC_SUBST([CYTHON_CFLAGS])
                 ], [])
               ])
             else
               AC_MSG_WARN([Use the "--without-cython" option to avoid this warning.])
             fi
 else
             CYTHON=false
 fi
 if [test "x$CYTHON" != "xfalse"]; then
             PKG_PROG_PKG_CONFIG
             AC_MSG_CHECKING([for libplist Cython bindings])
             CYTHON_PLIST_INCLUDE_DIR=$($PKG_CONFIG --variable=includedir libplist-2.0)/plist/cython
             if [test ! -d "$CYTHON_PLIST_INCLUDE_DIR"]; then
                 CYTHON=false
                 CYTHON_SUB=
                 cython_python_bindings=no
                 AC_MSG_RESULT([no])
                 AC_MSG_WARN([Unable to find libplist Cython bindings. You should install your distribution specific libplist Cython bindings package.])
             else
                 AC_SUBST([CYTHON_PLIST_INCLUDE_DIR])
                 AC_MSG_RESULT([$CYTHON_PLIST_INCLUDE_DIR])
                 CYTHON_SUB=cython
                 cython_python_bindings=yes
             fi
 else
             CYTHON_SUB=
             cython_python_bindings=no
 fi
 AM_CONDITIONAL([HAVE_CYTHON],[test "x$CYTHON_SUB" = "xcython"])
 AC_SUBST([CYTHON_SUB])

 default_openssl=yes

 AC_ARG_WITH([mbedtls],
             [AS_HELP_STRING([--without-mbedtls],
             [Do not look for mbedtls])],
             [use_mbedtls=$withval],
             [use_mbedtls=no])
 if test "x$use_mbedtls" == "xyes"; then
   default_openssl=no
 fi
 AC_ARG_WITH([gnutls],
             [AS_HELP_STRING([--without-gnutls],
             [Do not look for GnuTLS])],
             [use_gnutls=$withval],
             [use_gnutls=no])
 if test "x$use_gnutls" == "xyes"; then
   default_openssl=no
 fi
 AC_ARG_WITH([openssl],
             [AS_HELP_STRING([--without-openssl],
             [Do not look for OpenSSL])],
             [use_openssl=$withval],
             [use_openssl=$default_openssl])

 if test "x$use_mbedtls" == "xyes"; then
   CACHED_CFLAGS="$CFLAGS"
   conf_mbedtls_CFLAGS=""
   if test -n "$mbedtls_INCLUDES"; then
     CFLAGS=" -I$mbedtls_INCLUDES"
     conf_mbedtls_CFLAGS="-I$mbedtls_INCLUDES"
   fi
   conf_mbedtls_LIBS=""
   if test -n "$mbedtls_LIBDIR"; then
     conf_mbedtls_LIBS+=" -L$mbedtls_LIBDIR"
   fi
   if test -n "$mbedtls_LIBS"; then
     conf_mbedtls_LIBS+=" $mbedtls_LIBS"
   else
     conf_mbedtls_LIBS+=" -lmbedtls -lmbedx509 -lmbedcrypto"
   fi
   AC_CHECK_HEADER(mbedtls/ssl.h, [break], [AC_MSG_ERROR([MbedTLS support explicitly requested, but includes could not be found. Try setting mbedtls_INCLUDES=/path/to/mbedtls/include])])
   CFLAGS="$CACHED_CFLAGS"
   AC_DEFINE(HAVE_MBEDTLS, 1, [Define if you have MbedTLS support])
   ssl_lib_CFLAGS="$conf_mbedtls_CFLAGS"
   ssl_lib_LIBS="$conf_mbedtls_LIBS"
   AC_SUBST(ssl_lib_CFLAGS)
   AC_SUBST(ssl_lib_LIBS)
   ssl_provider="MbedTLS";
   ssl_requires=""
   AC_SUBST(ssl_requires)
 else
   if test "x$use_openssl" == "xyes"; then
     pkg_req_openssl="openssl >= 0.9.8"
     PKG_CHECK_MODULES(openssl, $pkg_req_openssl, have_openssl=yes, have_openssl=no)
     if test "x$have_openssl" != "xyes"; then
       AC_MSG_ERROR([OpenSSL support explicitly requested but OpenSSL could not be found])
     else
       AC_DEFINE(HAVE_OPENSSL, 1, [Define if you have OpenSSL support])
       ssl_lib_CFLAGS="$openssl_CFLAGS"
       ssl_lib_LIBS="$openssl_LIBS"
       AC_SUBST(ssl_lib_CFLAGS)
       AC_SUBST(ssl_lib_LIBS)
       ssl_provider="OpenSSL";
       ssl_requires="$pkg_req_openssl"
       AC_SUBST(ssl_requires)
     fi
   else
     if test "x$use_gnutls" == "xyes"; then
       pkg_req_gnutls="gnutls >= 2.2.0"
       pkg_req_libtasn1="libtasn1 >= 1.1"
       PKG_CHECK_MODULES(libgnutls, $pkg_req_gnutls)
       AC_CHECK_HEADERS([gcrypt.h])
       AC_CHECK_LIB(gcrypt, gcry_control, [AC_SUBST(libgcrypt_LIBS,[-lgcrypt])], [AC_MSG_ERROR([libgcrypt is required to build libimobiledevice with GnuTLS])])
       PKG_CHECK_MODULES(libtasn1, $pkg_req_libtasn1)
       AC_DEFINE(HAVE_GCRYPT, 1, [Define if you have libgcrypt support])
       AC_DEFINE(HAVE_GNUTLS, 1, [Define if you have GnuTLS support])
       ssl_lib_CFLAGS="$libgnutls_CFLAGS $libtasn1_CFLAGS $libgcrypt_CFLAGS"
       ssl_lib_LIBS="$libgnutls_LIBS $libtasn1_LIBS $libgcrypt_LIBS"
       AC_SUBST(ssl_lib_CFLAGS)
       AC_SUBST(ssl_lib_LIBS)
       ssl_provider="GnuTLS"
       ssl_requires="$pkg_req_gnutls $pkg_req_libtasn1"
       AC_SUBST(ssl_requires)
     else
       AC_MSG_ERROR([No SSL library configured. $PACKAGE cannot be built without a supported SSL library.])
     fi
   fi
 fi
 AM_CONDITIONAL(HAVE_MBEDTLS, test "x$use_mbedtls" == "xyes")
 AM_CONDITIONAL(HAVE_OPENSSL, test "x$use_openssl" == "xyes")
 AM_CONDITIONAL(HAVE_GCRYPT, test "x$use_gnutls" == "xyes")

 AC_ARG_ENABLE([wireless-pairing],
             [AS_HELP_STRING([--disable-wireless-pairing],
             [Do not build with wirless pairing support (default is yes)])])
 if test "$enable_wireless_pairing" != "no"; then
   AC_DEFINE(HAVE_WIRELESS_PAIRING,1,[Define if building with wireless pairing support])
 fi
 AM_CONDITIONAL(HAVE_WIRELESS_PAIRING, test "$enable_wireless_pairing" != "no")

 AC_ARG_ENABLE([debug],
             [AS_HELP_STRING([--enable-debug],
             [build debug message output code (default is no)])],
             [no_debug_code=false],
             [no_debug_code=true])
 if test "$no_debug_code" = true; then
 	building_debug_code=no
 	AC_DEFINE(STRIP_DEBUG_CODE,1,[Define if debug message output code should not be built.])
 else
 	building_debug_code=yes
 fi

 AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fsigned-char -fvisibility=hidden")
 AC_SUBST(GLOBAL_CFLAGS)

 case "$GLOBAL_CFLAGS" in
   *-fvisibility=hidden*)
     AC_DEFINE([HAVE_FVISIBILITY], [1], [Define if compiled with -fvisibility=hidden])
 esac

 # check for large file support
 AC_SYS_LARGEFILE

 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])

 AC_CONFIG_FILES([
 Makefile
 3rd_party/Makefile
 3rd_party/ed25519/Makefile
 3rd_party/libsrp6a-sha512/Makefile
 common/Makefile
 src/Makefile
 src/libimobiledevice-1.0.pc
 include/Makefile
 tools/Makefile
 cython/Makefile
 docs/Makefile
 doxygen.cfg
 ])
 AC_OUTPUT

 echo "
 Configuration for $PACKAGE $VERSION:
 -------------------------------------------

   Install prefix: .........: $prefix
   Debug code ..............: $building_debug_code
   Python bindings .........: $cython_python_bindings
   SSL support backend .....: $ssl_provider

   Now type 'make' to build $PACKAGE $VERSION,
   and then 'make install' for installation.
 "
	# -- Autoconf --
	# Process this file with autoconf to produce a configure script.

	AC_PREREQ([2.68])
	AC_INIT([libimobiledevice], [m4_esyscmd(./git-version-gen $RELEASE_VERSION)], [https://github.com/libimobiledevice/libimobiledevice/issues], [], [https://libimobiledevice.org])
	AM_INIT_AUTOMAKE([dist-bzip2 no-dist-gzip check-news])
	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
	AC_CONFIG_SRCDIR([src/])
	AC_CONFIG_HEADERS([config.h])
	AC_CONFIG_MACRO_DIR([m4])

	dnl libtool versioning
	# +1 : 0 : +1 == adds new functions to the interface
	# +1 : 0 : 0 == changes or removes functions (changes include both
	# changes to the signature and the semantic)
	# ? :+1 : ? == just internal changes
	# CURRENT : REVISION : AGE
	LIBIMOBILEDEVICE_SO_VERSION=6:0:0

	AC_SUBST(LIBIMOBILEDEVICE_SO_VERSION)

	# Check if we have a version defined
	if test -z $PACKAGE_VERSION; then
	AC_MSG_ERROR([PACKAGE_VERSION is not defined. Make sure to configure a source tree checked out from git or that .tarball-version is present.])
	fi

	dnl Minimum package versions
	LIBUSBMUXD_VERSION=2.0.2
	LIBPLIST_VERSION=2.3.0
	LIMD_GLUE_VERSION=1.0.0

	AC_SUBST(LIBUSBMUXD_VERSION)
	AC_SUBST(LIBPLIST_VERSION)
	AC_SUBST(LIMD_GLUE_VERSION)

	# Checks for programs.
	AC_PROG_CC
	AC_PROG_CXX
	AM_PROG_CC_C_O
	LT_INIT

	# Checks for libraries.
	PKG_CHECK_MODULES(libusbmuxd, libusbmuxd-2.0 >= $LIBUSBMUXD_VERSION)
	PKG_CHECK_MODULES(libplist, libplist-2.0 >= $LIBPLIST_VERSION)
	PKG_CHECK_MODULES(limd_glue, libimobiledevice-glue-1.0 >= $LIMD_GLUE_VERSION)

	# Checks for header files.
	AC_CHECK_HEADERS([stdint.h stdlib.h string.h sys/time.h])

	# Checks for typedefs, structures, and compiler characteristics.
	AC_C_CONST
	AC_TYPE_SIZE_T
	AC_TYPE_SSIZE_T
	AC_TYPE_UINT16_T
	AC_TYPE_UINT32_T
	AC_TYPE_UINT8_T

	# Checks for library functions.
	AC_CHECK_FUNCS([asprintf strcasecmp strdup strerror strndup stpcpy vasprintf getifaddrs])

	AC_CHECK_HEADER(endian.h, [ac_cv_have_endian_h="yes"], [ac_cv_have_endian_h="no"])
	if test "x$ac_cv_have_endian_h" = "xno"; then
	AC_DEFINE(__LITTLE_ENDIAN,1234,[little endian])
	AC_DEFINE(__BIG_ENDIAN,4321,[big endian])
	AC_C_BIGENDIAN([ac_cv_c_bigendian="yes"], [ac_cv_c_bigendian="no"], [], [])
	if test "x$ac_cv_c_bigendian" = "xyes"; then
	AC_DEFINE(__BYTE_ORDER,4321,[big endian byte order])
	else
	AC_DEFINE(__BYTE_ORDER,1234,[little endian byte order])
	fi
	fi

	AC_CHECK_DECL([plist_from_json], [AC_DEFINE([HAVE_PLIST_JSON], [1], [Define if libplist has JSON support])], [], [[#include <plist/plist.h>]])

	# Check for operating system
	AC_MSG_CHECKING([for platform-specific build settings])
	case ${host_os} in
	mingw32\|cygwin)
	AC_MSG_RESULT([${host_os}])
	win32=true
	AC_DEFINE(WINVER, 0x0501, [minimum Windows version])
	;;
	darwin*)
	AC_MSG_RESULT([${host_os}])
	darwin=true
	;;
	*)
	AC_MSG_RESULT([${host_os}])
	AX_PTHREAD([], [AC_MSG_ERROR([pthread is required to build $PACKAGE_NAME])])
	AC_CHECK_LIB(pthread, [pthread_once], [], [AC_MSG_ERROR([pthread with pthread_once required to build $PACKAGE_NAME])])
	;;
	esac
	AM_CONDITIONAL(WIN32, test x$win32 = xtrue)
	AM_CONDITIONAL(DARWIN, test x$darwin = xtrue)

	# Check if the C compiler supports __attribute__((constructor))
	AC_CACHE_CHECK([wether the C compiler supports constructor/destructor attributes],
	ac_cv_attribute_constructor, [
	ac_cv_attribute_constructor=no
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
	[[
	static void __attribute__((constructor)) test_constructor(void) {
	}
	static void __attribute__((destructor)) test_destructor(void) {
	}
	]], [])],
	[ac_cv_attribute_constructor=yes]
	)]
	)
	if test "$ac_cv_attribute_constructor" = "yes"; then
	AC_DEFINE(HAVE_ATTRIBUTE_CONSTRUCTOR, 1, [Define if the C compiler supports constructor/destructor attributes])
	fi

	AC_CHECK_MEMBER(struct dirent.d_type, AC_DEFINE(HAVE_DIRENT_D_TYPE, 1, [define if struct dirent has member d_type]),, [#include <dirent.h>])

	# Cython Python Bindings
	AC_ARG_WITH([cython],
	[AS_HELP_STRING([--without-cython],
	[build Python bindings using Cython (default is yes)])],
	[build_cython=false],
	[build_cython=true])
	if test "$build_cython" = "true"; then
	AC_PROG_CYTHON([0.17.0])
	if [test "x$CYTHON" != "xfalse"]; then
	AM_PATH_PYTHON([2.3], [
	CYTHON_PYTHON
	AS_COMPILER_FLAG([-Wno-cast-function-type -Werror], [
	CYTHON_CFLAGS+=" -Wno-cast-function-type"
	AC_SUBST([CYTHON_CFLAGS])
	], [])
	])
	else
	AC_MSG_WARN([Use the "--without-cython" option to avoid this warning.])
	fi
	else
	CYTHON=false
	fi
	if [test "x$CYTHON" != "xfalse"]; then
	PKG_PROG_PKG_CONFIG
	AC_MSG_CHECKING([for libplist Cython bindings])
	CYTHON_PLIST_INCLUDE_DIR=$($PKG_CONFIG --variable=includedir libplist-2.0)/plist/cython
	if [test ! -d "$CYTHON_PLIST_INCLUDE_DIR"]; then
	CYTHON=false
	CYTHON_SUB=
	cython_python_bindings=no
	AC_MSG_RESULT([no])
	AC_MSG_WARN([Unable to find libplist Cython bindings. You should install your distribution specific libplist Cython bindings package.])
	else
	AC_SUBST([CYTHON_PLIST_INCLUDE_DIR])
	AC_MSG_RESULT([$CYTHON_PLIST_INCLUDE_DIR])
	CYTHON_SUB=cython
	cython_python_bindings=yes
	fi
	else
	CYTHON_SUB=
	cython_python_bindings=no
	fi
	AM_CONDITIONAL([HAVE_CYTHON],[test "x$CYTHON_SUB" = "xcython"])
	AC_SUBST([CYTHON_SUB])

	default_openssl=yes

	AC_ARG_WITH([mbedtls],
	[AS_HELP_STRING([--without-mbedtls],
	[Do not look for mbedtls])],
	[use_mbedtls=$withval],
	[use_mbedtls=no])
	if test "x$use_mbedtls" == "xyes"; then
	default_openssl=no
	fi
	AC_ARG_WITH([gnutls],
	[AS_HELP_STRING([--without-gnutls],
	[Do not look for GnuTLS])],
	[use_gnutls=$withval],
	[use_gnutls=no])
	if test "x$use_gnutls" == "xyes"; then
	default_openssl=no
	fi
	AC_ARG_WITH([openssl],
	[AS_HELP_STRING([--without-openssl],
	[Do not look for OpenSSL])],
	[use_openssl=$withval],
	[use_openssl=$default_openssl])

	if test "x$use_mbedtls" == "xyes"; then
	CACHED_CFLAGS="$CFLAGS"
	conf_mbedtls_CFLAGS=""
	if test -n "$mbedtls_INCLUDES"; then
	CFLAGS=" -I$mbedtls_INCLUDES"
	conf_mbedtls_CFLAGS="-I$mbedtls_INCLUDES"
	fi
	conf_mbedtls_LIBS=""
	if test -n "$mbedtls_LIBDIR"; then
	conf_mbedtls_LIBS+=" -L$mbedtls_LIBDIR"
	fi
	if test -n "$mbedtls_LIBS"; then
	conf_mbedtls_LIBS+=" $mbedtls_LIBS"
	else
	conf_mbedtls_LIBS+=" -lmbedtls -lmbedx509 -lmbedcrypto"
	fi
	AC_CHECK_HEADER(mbedtls/ssl.h, [break], [AC_MSG_ERROR([MbedTLS support explicitly requested, but includes could not be found. Try setting mbedtls_INCLUDES=/path/to/mbedtls/include])])
	CFLAGS="$CACHED_CFLAGS"
	AC_DEFINE(HAVE_MBEDTLS, 1, [Define if you have MbedTLS support])
	ssl_lib_CFLAGS="$conf_mbedtls_CFLAGS"
	ssl_lib_LIBS="$conf_mbedtls_LIBS"
	AC_SUBST(ssl_lib_CFLAGS)
	AC_SUBST(ssl_lib_LIBS)
	ssl_provider="MbedTLS";
	ssl_requires=""
	AC_SUBST(ssl_requires)
	else
	if test "x$use_openssl" == "xyes"; then
	pkg_req_openssl="openssl >= 0.9.8"
	PKG_CHECK_MODULES(openssl, $pkg_req_openssl, have_openssl=yes, have_openssl=no)
	if test "x$have_openssl" != "xyes"; then
	AC_MSG_ERROR([OpenSSL support explicitly requested but OpenSSL could not be found])
	else
	AC_DEFINE(HAVE_OPENSSL, 1, [Define if you have OpenSSL support])
	ssl_lib_CFLAGS="$openssl_CFLAGS"
	ssl_lib_LIBS="$openssl_LIBS"
	AC_SUBST(ssl_lib_CFLAGS)
	AC_SUBST(ssl_lib_LIBS)
	ssl_provider="OpenSSL";
	ssl_requires="$pkg_req_openssl"
	AC_SUBST(ssl_requires)
	fi
	else
	if test "x$use_gnutls" == "xyes"; then
	pkg_req_gnutls="gnutls >= 2.2.0"
	pkg_req_libtasn1="libtasn1 >= 1.1"
	PKG_CHECK_MODULES(libgnutls, $pkg_req_gnutls)
	AC_CHECK_HEADERS([gcrypt.h])
	AC_CHECK_LIB(gcrypt, gcry_control, [AC_SUBST(libgcrypt_LIBS,[-lgcrypt])], [AC_MSG_ERROR([libgcrypt is required to build libimobiledevice with GnuTLS])])
	PKG_CHECK_MODULES(libtasn1, $pkg_req_libtasn1)
	AC_DEFINE(HAVE_GCRYPT, 1, [Define if you have libgcrypt support])
	AC_DEFINE(HAVE_GNUTLS, 1, [Define if you have GnuTLS support])
	ssl_lib_CFLAGS="$libgnutls_CFLAGS $libtasn1_CFLAGS $libgcrypt_CFLAGS"
	ssl_lib_LIBS="$libgnutls_LIBS $libtasn1_LIBS $libgcrypt_LIBS"
	AC_SUBST(ssl_lib_CFLAGS)
	AC_SUBST(ssl_lib_LIBS)
	ssl_provider="GnuTLS"
	ssl_requires="$pkg_req_gnutls $pkg_req_libtasn1"
	AC_SUBST(ssl_requires)
	else
	AC_MSG_ERROR([No SSL library configured. $PACKAGE cannot be built without a supported SSL library.])
	fi
	fi
	fi
	AM_CONDITIONAL(HAVE_MBEDTLS, test "x$use_mbedtls" == "xyes")
	AM_CONDITIONAL(HAVE_OPENSSL, test "x$use_openssl" == "xyes")
	AM_CONDITIONAL(HAVE_GCRYPT, test "x$use_gnutls" == "xyes")

	AC_ARG_ENABLE([wireless-pairing],
	[AS_HELP_STRING([--disable-wireless-pairing],
	[Do not build with wirless pairing support (default is yes)])])
	if test "$enable_wireless_pairing" != "no"; then
	AC_DEFINE(HAVE_WIRELESS_PAIRING,1,[Define if building with wireless pairing support])
	fi
	AM_CONDITIONAL(HAVE_WIRELESS_PAIRING, test "$enable_wireless_pairing" != "no")

	AC_ARG_ENABLE([debug],
	[AS_HELP_STRING([--enable-debug],
	[build debug message output code (default is no)])],
	[no_debug_code=false],
	[no_debug_code=true])
	if test "$no_debug_code" = true; then
	building_debug_code=no
	AC_DEFINE(STRIP_DEBUG_CODE,1,[Define if debug message output code should not be built.])
	else
	building_debug_code=yes
	fi

	AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fsigned-char -fvisibility=hidden")
	AC_SUBST(GLOBAL_CFLAGS)

	case "$GLOBAL_CFLAGS" in
	-fvisibility=hidden)
	AC_DEFINE([HAVE_FVISIBILITY], [1], [Define if compiled with -fvisibility=hidden])
	esac

	# check for large file support
	AC_SYS_LARGEFILE

	m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])

	AC_CONFIG_FILES([
	Makefile
	3rd_party/Makefile
	3rd_party/ed25519/Makefile
	3rd_party/libsrp6a-sha512/Makefile
	common/Makefile
	src/Makefile
	src/libimobiledevice-1.0.pc
	include/Makefile
	tools/Makefile
	cython/Makefile
	docs/Makefile
	doxygen.cfg
	])
	AC_OUTPUT

	echo "
	Configuration for $PACKAGE $VERSION:
	-------------------------------------------

	Install prefix: .........: $prefix
	Debug code ..............: $building_debug_code
	Python bindings .........: $cython_python_bindings
	SSL support backend .....: $ssl_provider

	Now type 'make' to build $PACKAGE $VERSION,
	and then 'make install' for installation.
	"